True or false postulates/theorems, if it is false correct (or insert) a single word so that it is true (if it is not always true it is false). 1. If two congruent segments are bisected, then the three resulting segments are congruent. (Theorem 6.1)

2. Segment congruence is an equivalence relation. (Theorem 6.2) 3. Supplements of congruent angles are acute. (Theorem 6.3) 4. Complements of congruent angles are congruent. (Theorem 6.4) 5. Angle congruence is an equivalence relation. (Theorem 6.5) 6. If two adjacent angles are congruent to another pair of adjacent angles, then the larger angles formed are congruent. (Theorem 6.6) 7. If two angles, one in each of two pairs of adjacent angles, are congruent, and the larger angles formed are also congruent, then the other two angles are congruent. (Theorem 6.7) 8. If two congruent angles are bisected, the four resulting angles are obtuse. (Theorem 6.8) 9. Triangle congruence is an equivalence relation. (Theorem 6.9) 10. Circle congruence is an nonequivalence relation. (Theorem 6.10) 11. Polygon congruence is an equivalence relation. (Theorem 6.11) 12. Two lines intersected by a triangle are parallel if and only if the alternate interior angles are congruent. (Postulate 6.1) 13. Two lines intersected by a transversal are parallel if and only if the alternate exterior angles are congruent. (Theorem 6.12) 14. Two lines intersected by a circle are parallel if and only if the corresponding angles are congruent. (Theorem 6.13) 15. If a transversal is perpendicular to one of two parallel lines, then it is parallel to the other also. (Theorem 6.14) 16. If two coplanar lines are perpendicular to the same line, then they are parallel to each other. (Theorem 6.15) 17. The sum of the measures of the angles of any triangle is 360°. (Theorem 6.16) 18. If two angles of one triangle are congruent to two angles of another triangle, then the third angles are also congruent. (Theorem 6.17) 19. The acute angles of a right triangle are supplementary. (Theorem 6.18) 20. In an isosceles triangle the two base angles are obtuse. (Theorem 6.20) 21. If two angles of a triangle are congruent, then the sides opposite those angles are congruent, and the triangle is an isosceles triangle. (Theorem 6.21)

22. A triangle is acute if and only if it is equiangular. (Theorem 6.22) 23. What are four ways of proving that two triangles are congruent?

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The set consisting of two points A and B and all the points in between. The union of two distinct rays with a common endpoint. The union of a half-line and its origin. It extends infinitely in one direction from a point. A line in the plane of a circle that intersects the circle in exactly one point.

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